netdev - Re: [net-next PATCH v5 7/9] net: phy: qcom: add support for QCA807x PHY Family

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Date: Fri, 2 Feb 2024 02:35:11 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Frank Rowand <frowand.list@...il.com>,
	Robert Marko <robert.marko@...tura.hr>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [net-next PATCH v5 7/9] net: phy: qcom: add support for QCA807x
 PHY Family

> +static int qca807x_read_fiber_status(struct phy_device *phydev)
> +{
> +	int ss, err, lpa, old_link = phydev->link;
> +
> +	/* Update the link, but return if there was an error */
> +	err = genphy_update_link(phydev);
> +	if (err)
> +		return err;
> +
> +	/* why bother the PHY if nothing can have changed */
> +	if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
> +		return 0;
> +
> +	phydev->speed = SPEED_UNKNOWN;
> +	phydev->duplex = DUPLEX_UNKNOWN;
> +	phydev->pause = 0;
> +	phydev->asym_pause = 0;
> +
> +	if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
> +		lpa = phy_read(phydev, MII_LPA);
> +		if (lpa < 0)
> +			return lpa;
> +
> +		linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
> +				 phydev->lp_advertising, lpa & LPA_LPACK);
> +		linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
> +				 phydev->lp_advertising, lpa & LPA_1000XFULL);
> +		linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
> +				 phydev->lp_advertising, lpa & LPA_1000XPAUSE);
> +		linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
> +				 phydev->lp_advertising,
> +				 lpa & LPA_1000XPAUSE_ASYM);
> +
> +		phy_resolve_aneg_linkmode(phydev);
> +	}

This looks a lot like genphy_c37_read_status(). Can it be used?

> +
> +	/* Read the QCA807x PHY-Specific Status register fiber page,
> +	 * which indicates the speed and duplex that the PHY is actually
> +	 * using, irrespective of whether we are in autoneg mode or not.
> +	 */
> +	ss = phy_read(phydev, AT803X_SPECIFIC_STATUS);
> +	if (ss < 0)
> +		return ss;
> +
> +	if (ss & AT803X_SS_SPEED_DUPLEX_RESOLVED) {
> +		switch (FIELD_GET(AT803X_SS_SPEED_MASK, ss)) {
> +		case AT803X_SS_SPEED_100:
> +			phydev->speed = SPEED_100;
> +			break;
> +		case AT803X_SS_SPEED_1000:
> +			phydev->speed = SPEED_1000;
> +			break;
> +		}
> +
> +		if (ss & AT803X_SS_DUPLEX)
> +			phydev->duplex = DUPLEX_FULL;
> +		else
> +			phydev->duplex = DUPLEX_HALF;
> +	}
> +
> +	return 0;
> +}


> +static int qca807x_phy_package_probe_once(struct phy_device *phydev)
> +{
> +	struct phy_package_shared *shared = phydev->shared;
> +	struct qca807x_shared_priv *priv = shared->priv;
> +	unsigned int tx_driver_strength = 0;
> +	const char *package_mode_name;
> +
> +	of_property_read_u32(shared->np, "qcom,tx-driver-strength",
> +			     &tx_driver_strength);
> +	switch (tx_driver_strength) {
> +	case 140:
> +		priv->tx_driver_strength = PQSGMII_TX_DRIVER_140MV;
> +		break;
> +	case 160:
> +		priv->tx_driver_strength = PQSGMII_TX_DRIVER_160MV;
> +		break;
> +	case 180:
> +		priv->tx_driver_strength = PQSGMII_TX_DRIVER_180MV;
> +		break;
> +	case 200:

...

> +	case 500:
> +		priv->tx_driver_strength = PQSGMII_TX_DRIVER_500MV;
> +		break;
> +	case 600:
> +	default:

If its missing default to 600. But if its an invalid value, return
-EINVAL.

> +		priv->tx_driver_strength = PQSGMII_TX_DRIVER_600MV;
> +	}
> +
> +	priv->package_mode = PHY_INTERFACE_MODE_NA;
> +	if (!of_property_read_string(shared->np, "qcom,package-mode",
> +				     &package_mode_name)) {
> +		if (!strcasecmp(package_mode_name,
> +				phy_modes(PHY_INTERFACE_MODE_PSGMII)))
> +			priv->package_mode = PHY_INTERFACE_MODE_PSGMII;
> +
> +		if (!strcasecmp(package_mode_name,
> +				phy_modes(PHY_INTERFACE_MODE_QSGMII)))
> +			priv->package_mode = PHY_INTERFACE_MODE_QSGMII;

Again, return -EINVAL if it is neither.

> +static int qca807x_phy_package_config_init_once(struct phy_device *phydev)
> +{
> +	struct phy_package_shared *shared = phydev->shared;
> +	struct qca807x_shared_priv *priv = shared->priv;
> +	int val, ret;
> +
> +	phy_lock_mdio_bus(phydev);
> +
> +	/* Set correct PHY package mode */
> +	val = __phy_package_read(phydev, QCA807X_COMBO_ADDR,
> +				 QCA807X_CHIP_CONFIGURATION);
> +	val &= ~QCA807X_CHIP_CONFIGURATION_MODE_CFG_MASK;
> +	if (priv->package_mode == PHY_INTERFACE_MODE_QSGMII)
> +		val |= QCA807X_CHIP_CONFIGURATION_MODE_QSGMII_SGMII;
> +	else
> +		val |= QCA807X_CHIP_CONFIGURATION_MODE_PSGMII_ALL_COPPER;

What about priv->package_mode == PHY_INTERFACE_MODE_NA;

     Andrew